Make //tols/cpp/test start from the distribution artifact

The docker tests in //tools/cpp/test still assume that the sources
are enough to just compile.sh to bootstrap a bazel binary. Fix this,
by using the distribution archive instead.

While there, also add a target for the distribution archive as tar.

--
Change-Id: Ic31bb95da0165f83a14537a1719c27e5067d0d65
Reviewed-on: https://cr.bazel.build/7531
MOS_MIGRATED_REVID=140134322

BUILD

@@ -71,3 +71,16 @@ genrule(
     # Public but bazel-only visibility.
     visibility = ["//:__subpackages__"],
 )
+
+genrule(
+    name = "bazel-distfile-tar",
+    srcs = [
+        ":bazel-srcs",
+        "//src:derived_java_srcs",
+    ],
+    outs = ["bazel-distfile.tar"],
+    cmd = "env USE_TAR=YES $(location :combine_distfiles.sh) $@ $(SRCS)",
+    tools = ["combine_distfiles.sh"],
+    # Public but bazel-only visibility.
+    visibility = ["//:__subpackages__"],
+)

combine_distfiles.sh

@@ -40,4 +40,10 @@ do
     (cd "${PACKAGE_DIR}" && ${UNPACK} "${ARCHIVE}")
 done
 
-(cd "${PACKAGE_DIR}" && find . -type f | sort | zip -qDX@ "${OUTPUT}")
+if [ -n "${USE_TAR}" ]
+then
+  (cd "${PACKAGE_DIR}" && tar -c -f "${OUTPUT}" --group=0 --owner=0 \
+     $(find . -type f | sort))
+else
+  (cd "${PACKAGE_DIR}" && find . -type f | sort | zip -qDX@ "${OUTPUT}")
+fi

tools/cpp/test/BUILD

@@ -43,7 +43,7 @@ pkg_tar(
     name = "bazel_cc_configure",
     package_dir = "/opt/workspace",
     strip_prefix = "/",
-    deps = ["//:bazel-srcs"],
+    deps = ["//:bazel-distfile-tar"],
 )
 
 [